Main Engine 4-Stroke · Main Engines (4-Stroke)
This marine engine is commonly found powering large cargo vessels, where its robust design and reliable performance are essential for long-range maritime operations. The 8H35/40 engine is configured with an L-type arrangement and features eight cylinders, each with a bore of 350 mm and a stroke of 400 mm, delivering a power output of 4480 kW at 720 rpm. It is designed to operate on heavy fuel oil (HFO) or marine gas oil (MGO) and employs advanced Common Rail Tier II technology to ensure optimal combustion efficiency. Maintenance challenges can include cylinder cover wear and corrosion in marine environments, water contamination in the crankcase lubricating oil leading to acid formation and wear, and abrasive particle-induced wear on piston rings and bearings. Additionally, regular inspections and cleaning of the turbocharger are necessary to prevent compressor and turbine wear.
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| Fuel Injector Overhaul | 3,000 - 6,000 running hours |
|---|---|
| Exhaust Valve Overhaul/Replacement | 6,000 - 12,000 running hours |
| Cylinder Head Overhaul | 6,000 - 12,000 running hours (often coincides with exhaust valves) |
| Piston Overhaul (rings, cleaning) | 12,000 - 18,000 running hours |
| Turbocharger Overhaul | 12,000 - 24,000 running hours |
| Main & Connecting Rod Bearing Inspection | 18,000 - 24,000 running hours |
| Major Engine Overhaul | 24,000 - 36,000 running hours |
| Cylinder Liner Wear (max diameter increase) | 0.6 - 0.8 mm |
|---|---|
| Piston Ring Groove Wear (axial clearance increase) | 0.1 - 0.2 mm |
| Exhaust Valve Seat Recession | 0.5 - 1.0 mm |
| Main Bearing Clearance (increase from new) | 0.15 - 0.25 mm |
| Connecting Rod Bearing Clearance (increase from new) | 0.10 - 0.20 mm |
| Turbocharger Rotor Axial Play | 0.1 - 0.2 mm (manufacturer specific) |
Ranges are typical for this design class. Always confirm against the manufacturer documentation for your serial number.
A class surveyor will typically focus on verifying the engine's compliance with statutory and classification rules. This includes a thorough review of engine logbooks, maintenance records, lube oil analysis reports, and indicator diagrams. Key checks involve testing of all safety devices (overspeed, low LO pressure, high CW temp), visual inspection of the engine's overall condition, foundation bolts, exhaust system integrity, and fuel oil system for leaks or fire hazards. If the engine is opened for maintenance, the surveyor will inspect internal components such as cylinder liners, pistons, bearings, and valves for wear and condition. The starting air system, including relief valves and non-return valves, will also be checked for proper function and certification. Emphasis will be placed on the Common Rail system's integrity and any modifications.
Estimated lifetime: 24,000 - 36,000 running hours before major overhaul (depending on maintenance and operating conditions)
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